There is obviously a lot wrong between him and the girl. They were at dinner together, there was no conversation; she loves him and wanted to know if something was bothering him. Something was, but he wouldn't tell her.

His mind was on 'someone else', just as she thought.

If men don't like everything being 'mixed together', perhaps they could leave their motorbikes at the door when they're on an intimate date with their partner, or otherwise bring the bike in to meet her.